1. Make the batter by mixing all the ingredients from corn flour to ground black pepper. Marinate the chicken pcs for 30 min.
2. Heat cooking oil in a wok or kadai. Deep fry the chicken pcs till golden brown. Keep aside.
3. In the same oil, add green chilies. Fry for a minute. Add sliced onions, and fry for 2 minutes in medium to high heat.
4. Add the fried chicken pcs, and fry for 5 minutes. Add red chili powder (optional).
5. In the meantime, prepare a sauce by mixing soya sauce, vinegar, corn flour in a cup of water. Mix properly.
6. Add the prepared sauce to the fried chicken and onions. Fry for few minutes, till the gravy thickens. Remove from heat. Serve with fried rice or noodles.